In order to install an AlertMaxx2 in place of an existing AlertMaxx, please follow the below wiring guidance document.
Please note, the AlertMaxx2 will need to be located near to the pump spurs. The float cable/AlertMaxx may be installed in another location to the pump spurs. All pump and float wiring must terminate inside the AlertMaxx2. This implies you may need to route the float cable to the location of the AlertMaxx2.
The electrical installation must comply with the requirements of BS 7671:2008 'Requirements for Electrical Installations' Incorporating amendment 3:2015.